that motivates the terrorism. i describe in the book, fred, i have sat down with al-qaeda-linked terrorists face to face, associates of osama bin laden who have told me we're not doing this because of poverty, not because of the israeli/palestinian conflict. we are doing this because islam's core texts command us to do it. now, that's very politically incorrect, but this is no time to mince words, fred, as you know. and this is not me saying it, it's the bad guys saying this themselves. we should, in this case at least, we should heed their words. .. >> but what it has always been is a deep commitment to islam and from what i can tell, strict islam, shari'a law. shari'a law, as you define it -- >> guest: well, let them ask you, you do a great description of what shari'a is. why don't you tell us what shari'a law is and what it undermines all the ideology you were talking about. >> guest: shari'a, and this is the fundamental thing to remember here. shari'a is inherently incompatible with the u.s. constitution. >> host: no that's what faisal the grand imam of ground zero who was somewhat demoted.